Guide-bar for lining up the curves of street-surfaces



(No Model.)

J. M. MACK. GUIDE BAR FOR LINING UP THE CURVES 01? STREET SURFACES.

No. 404,491. Patented June 4,1889.

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JAMES M. MACK, OF PHILADELPHIA, PENNSYLVANIA.

GUIDE-BAR FOR LlNING UP THE CURVES 0F STREET-SURFACES.

SPECIFICATION forming part of Letters Patent No. 404,491, dated June 4,1889.

Application filed March 5, 1889.

To all whom it may concern:

Be it known that 1, JAMES M. MACK, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inGuide-Bars for Lining Up the Curves of Street-Surfaces; and I do declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings, and to the letters and figures of referencemarked thereon, which form a part of this specification.

My invention relates to devices for lining up and regulating the arch orcurve of the. bed of a street, and has for its object the provision ofcurved liners or gages which are used in pairs, each extending from thecurb to the center of thestreet, where they meet and are suitablyjointed. As many of these pairs as are desired may be arranged atsuitable distances apart along the street extending from curb to curb,and gravel, sand, or other filling material is then thrown until it isas high as the top of the arched liners or gages, and then astraight-edge is run transversely across the street from curb to curb,and the bed will be found to be accurately and evenly arched. Theseliners or gages are preferably made T shape in cross-section,with thestem of theT projecting down ward, which gives them strength and allowsthe stem to be sunk into the bed of the street. These devices may beused to get the curve of alleys and narrow streets in which the centeris the lowest by simply turning them upside down or reversing thecurves.

The accompanying drawings illustrate my invention.

Figure 1 is a longitudinal section of a roadbed, showing the devices inplace. Fig. 2 is a side elevation of the liners or gages. Fig. 3 is atransverse section of a road-bed.

Similar letters of reference indicate corresponding parts in all thefigures where they occur.

A represents the bed of the street, and A A the curbs.

B B are the liners or gages, which are arched as shown, and laid inpairs, as shown, extend- Serial No. 301 ,885 (N0 model.)

ing from curb to curb, meeting in the center of the street, and, ifdesired, provided with an overlapped joint 13*, which unites them insuch a way as to preserve the curve of the two gages or liners.

B B are wings on the under side of the gages,which in cross-section areT-shaped, the wings forming the stem of the T. The wings strength en thegages an d preserve their arched form. These gages or liners are set inpairs across the street-bed from curb to curb at suitable intervals, thestreet filled up, and a suitable straight-edge O, resting'each end on aliner, is drawn across the street. strike the filling material to thesame level and curve as the liners or gages.

If it is desired to line an alley or small street with the centerdepressed, it is only necessary to turn the liners or gages over.

The liners or gages are preferably made of metal. They may be made inone piece instead of two, as shown.

After the bed is rounded up the liners or theyhave made are filled up.

Having thus described my invention, what I 1. A removable arched lineror gage for regulating the curve or arch of a road-bed formed upon acurve or shape to which the bed is to be conformed andhaving a flat topwhose upper. surface is adapted to coincide with the surface of thepavement, as set forth.

2. A removable arched liner or gage for regulating the curve or arch ofa road-bed, consisting of a curved metallic piece T- shaped incross-section, the head of the T resting upon and its top face beinglevel with the upper surface of the filling, as set forth.

3. The combination of a pair of removable arched liners or gagesextending from curb to curb and meeting in the center of the roadbed andhaving an offset-joint, as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

JAMES M. MACK.

Witnesses:

THos. D. MoWLns, GEORGE W. CLEMENT.

This will gages are removed and the channels which claim, and desire tosecure by Letters Patent,

